Securing gun safe in an apartment?

I recently purchased a safe for my gun and other valuables. I'm glad to have it, however I live in an apartment and now I have the problem of how to secure the safe itself. Obviously if someone broke in, a safe is basically advertising "take me".

I only have wire-rack shelves in my closets, and the mounting kit that came with the safe is just a couple of screws and anchors. They would attach through the bottom it seems. I live on the third floor and I'm pretty sure the floors under the carpet are gonna be wood, although I don't know because I haven't attempted to pull up the carpet. It didn't come with a tether.